In a preliminary root cause analysis, the Pennsylvania Emergency Management Agency (PEMA) said the issue stemmed from a routine software update by Comtech, a vendor that provides 911 infrastructure for several states. The update triggered a defect in the system’s operating software, disrupting call delivery to emergency centers.

The state’s 9-1-1 system experienced an outage earlier this month, and the Pennsylvania Emergency Management Agency (PEMA) has shared its findings after a preliminary analysis. According to PEMA, the analysis found that the issues were due to a defect in an operating system,

The Pennsylvania 911 call system outage earlier this month was caused by a technical issue, not a cyberattack, according to a preliminary report. People calling 911 in Pennsylvania experienced intermittent disruptions on July 12.